JP2005225341A - Vehicle equipped with car body frame having cushioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle equipped with a frame structure of a high strength which can prevent a buckling breakage of a side rail due to a bending moment caused by an eccentric load after the impact has been absorbed by a cushioning device by remarkably increasing the supporting rigidity than that of a conventional supporting structure. <P>SOLUTION: A reinforcing cross member of which both end sections are connected with the side rails is laterally provided between a cross member being closer to the cushioning device which softens an impact load applied to a car body frame from among a plurality of cross members which are laterally provided in the vehicle width direction across a pair of right and left side rails, and the cushioning device. At the same time, a pair of brackets which transmit the load applied to the cushioning device to the reinforcing cross member side when received the load are inserted between the connected section of the side rails with the reinforcing cross members and their vicinity areas, and an attaching member of the cushioning device. This vehicle is constituted in such a manner that the load from the cushioning device side is supported by the frame structure which is formed of a pair of the brackets, the reinforcing cross member, the cross member being closer to the cushioning device, and a pair of the right and left side rails. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is applied to a road maintenance work vehicle or the like, and a plurality of cross members horizontally disposed in the vehicle width direction are disposed between the side rails with an appropriate interval in the vehicle body front-rear direction between the side rails. In addition, the present invention relates to a vehicle including a vehicle body frame with a shock absorber that is provided at the end of the vehicle body frame with a shock absorber that reduces an impact load acting on the vehicle body frame.

As a shock absorber that extends in the vehicle width direction and relaxes an impact load acting on the vehicle body frame, for example, a shock absorber provided with a mechanical fuse as disclosed in Patent Document 1 (Japanese Utility Model Publication No. 2-49402) is used. A vehicle including a vehicle body frame with a shock absorber attached to an end portion of the frame is used for a road maintenance work vehicle or the like.
In a vehicle equipped with such a vehicle body frame with a shock absorber, when an impact uneven load deviating from the vehicle body center in the vehicle width direction acts on the shock absorber, for example, Patent Document 2 (Japanese Patent No. 3289629) shows. As described above, the unbalanced load after the shock is absorbed by the shock absorber is a bar-shaped bracket constructed between the shock absorber mounting member and the outer surface of the pair of side rails, and between the pair of side rails. It is comprised so that it may support from the support structure formed by one cross member laid horizontally and a pair of side rail.

Japanese Utility Model Publication No. 2-49402 Japanese Patent No. 3289629

  In such a conventional load support structure for a vehicle body frame with a shock absorber, when an impact load that deviates from the center of the vehicle body in the vehicle width direction acts on the shock absorber due to a vehicle collision, the shock absorber is provided. The unbalanced load after the shock is absorbed by the bar-shaped bracket laid between the mounting member of the shock absorber and the outer side surface of the pair of side rails is placed horizontally between the pair of side rails. Since it is supported by a support structure formed by one cross member and a pair of side rails, the support rigidity for supporting the buckling load of the side rail due to the bending moment caused by the unbalanced load is sufficient. However, buckling failure is likely to occur in the side rail.

  Therefore, in view of the problems of the prior art, the present invention causes the uneven load after the shock is absorbed by the shock absorber to be generated by the uneven load by making the support rigidity much larger than that of the conventional support structure. It is an object of the present invention to provide a vehicle including a high-strength frame structure that can prevent occurrence of buckling failure of a side rail due to a bending moment.

The present invention achieves such an object, and a plurality of cross members that are laterally arranged in the vehicle width direction and are connected to both side rails between a pair of left and right side rails that extend in the longitudinal direction of the vehicle body. And a shock absorber that relieves an impact load acting on the body frame at the time of a vehicle longitudinal collision at the end of the body frame. In a vehicle equipped with a body frame with a shock absorber,
An attachment member for attaching the shock absorber to the end portion of the vehicle body frame, and a bracket interposed between the attachment member and the outside of the vehicle body frame to reinforce a fixing portion of the attachment member to the vehicle body frame; A reinforcing cross member is provided in the vicinity of a fixing portion of the bracket to the vehicle body frame, and both ends thereof are connected to side rails of the vehicle body frame.

  According to this invention, when an impact uneven load that deviates from the vehicle body center in the vehicle width direction acts on the shock absorber due to a vehicle collision, the uneven load after the shock is absorbed by the shock absorber is the shock absorber. Is transmitted to the bracket through the mounting member, and is transmitted from the bracket to the reinforcing cross member and the cross member via a fixing portion of the bracket to the vehicle body frame and one side of the side rail of the vehicle body frame. It is transmitted to the other side rail via the reinforcing cross member and the cross member.

  Therefore, according to this invention, the uneven load after the shock is absorbed by the shock absorber is applied to the mounting member, the bracket interposed between the mounting member and the outside of the vehicle body frame, and the pair of side surfaces. Since it is supported by a frame structure formed by a reinforcing cross member horizontally disposed between the rails, the cross member, and a pair of side rails, a rod-like bracket and a pair of side rails as in Patent Document 2 The support rigidity is significantly greater than that of the support structure formed by one cross member and a pair of side rails disposed between the side members. The occurrence of buckling failure can be prevented.

In this invention, preferably, at least one of the plurality of cross members is provided in the vicinity of the reinforcing cross member in the vehicle longitudinal direction.
According to this configuration, the impact cross load is received by the two beam-like bodies of the reinforcing cross member and the cross member provided in the vicinity of the reinforcing cross member in the longitudinal direction of the vehicle body. The support rigidity in the vicinity of the joint portion between the member and the cross member is increased.

  Preferably, in the invention, the bracket has a substantially triangular planar shape when viewed in the vehicle vertical direction, and one side of the bracket is coupled to the outer surface of the side rail near the connecting portion with the reinforcing cross member. The other side is coupled to the mounting member of the shock absorber, and the connecting portion of the reinforcing cross member to the side rail is disposed in the coupling surface of the bracket to the side rail.

  If comprised in this way, each said bracket will form the planar shape seen in the vehicle up-down direction so that it may form a substantially triangular shape, The one side is the outer side surface of the connection part with the reinforcement cross member of a side rail. And the other side is connected to the mounting member of the shock absorber, so that the flow of the load passing through the bracket from the mounting member side of the shock absorber has no deflection and the flow is uniform. It is possible to prevent the vicinity of the connecting portion from being damaged by an excessive force acting on the connecting portion between the side rail and the connecting portion between the bracket and the mounting member.

Preferably, in the invention, the one side of the substantially triangular shape that is coupled to the outer surface of the side rail of the bracket is between the attachment portion from the coupling portion of the reinforcing cross member and the side rail, A plurality of bolts are fastened to the outer surface of the side rail over substantially the entire area.
If comprised in this way, the offset load which the shock absorber received by shifting outward in the vehicle width direction is applied to the side surface of the side rail in substantially the entire area between the connecting portion of the reinforcing cross member and the side rail to the mounting member. In addition to being transmitted as surface pressure, the impact force in the vehicle front-rear direction is also shared by a plurality of bolts and transmitted to the side rail side, so that stress is dispersed and the effect as an impact force buffering device is improved.

  According to the present invention, the uneven load after the shock is absorbed by the shock absorber is applied to the mounting member, the bracket whose planar shape is formed in a substantially triangular shape, and the reinforcing cross member horizontally disposed between the pair of side rails. And the cross member in the vicinity of the reinforcing cross member, and a frame structure formed by a pair of side rails, the support rigidity is significantly greater than that of the conventional support structure, and the uneven load The occurrence of buckling failure of the side rail due to the bending moment generated by the above can be prevented, and a high-strength frame structure can be configured.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.
FIG. 1 is a schematic plan view of a main part showing a configuration of a vehicle body frame with a shock absorber for a road maintenance work vehicle according to an embodiment of the present invention. FIG. 2 is a plan view of the road maintenance work vehicle in the embodiment, and FIG. 3 is a side view. FIG. 4 is a schematic perspective view of the bracket mounting portion in the embodiment.

1 and 2 to 3 showing an embodiment of the present invention, 100 is a vehicle body frame of the road maintenance work vehicle, 101 is a cabin, 102 is a front wheel, 103 is a rear wheel, 104 is a loading platform, and 1 is a vehicle body longitudinal direction. It is a pair of left and right side rails extending in the direction.
A shock absorber 30 is attached to the rear end of the side rail 1 and is provided over the vehicle width direction to relieve an impact load acting on the vehicle body frame 100. The shock absorber 30 includes a plurality of mechanical fuses 3 arranged in parallel between an attachment member (fuse support frame) 5 and an impact receiving member 3a. When an impact load is applied to the impact receiving member 3a due to a vehicle collision, When the mechanical fuse 3 is crushed, the impact load is absorbed. The structure itself of the mechanical fuse 3 in the shock absorber 30 is the same as that of the prior art such as the above-mentioned Patent Document 1 (Japanese Utility Model Publication No. 2-49402).

Reference numerals 2 and 6 are cross members horizontally provided in the vehicle width direction between the pair of left and right side rails 1. A plurality of cross members are provided at appropriate intervals in the longitudinal direction of the vehicle body, and both end portions are interposed via gussets 2a. Are connected to the side rail 1. In this example, the cross members 2 and 6 are arranged before and after the rear wheel 103, but can be arranged at arbitrary positions.
Reference numeral 10 denotes a reinforcing cross member that is laterally disposed between the pair of left and right side rails 1 in the vehicle width direction. Among the plurality of cross members 2 and 6, the cross member 2 near the shock absorber 30 and the shock absorber 30 is disposed in the vicinity of the cross member 2.
That is, one of the plurality of cross members 2 and 6 is arranged in the vicinity of the reinforcing cross member 10 in the longitudinal direction of the vehicle body.

Both ends of the reinforcing cross member 10 and the side rail 1 are connected via a gusset 12. As shown in FIG. 2, the gusset 12 is expanded in the front-rear direction of the vehicle body from the end of the reinforcing cross member 10 and fixed to the side surface of the side rail 1 in a planar shape. .
Thus, since the gusset 12 is provided in the connection part 11 (refer FIG. 1) of the said reinforcement cross member 10 and the side rail 1, the rigidity of this connection part 11 increases. Further, by forming the gusset 12 in a shape that is expanded from the end of the reinforcing cross member 10 in the longitudinal direction of the vehicle body, the rigidity between the reinforcing cross member 10 and the side rail 1 in the vicinity of the connecting portion 11 is increased. Can be prevented from suddenly changing, and stress concentration in the vicinity of the connecting portion 11 can be avoided.

  Reference numeral 4 denotes a pair of brackets installed between the outer side surfaces of the pair of side rails 1 and the mounting member 5 of the shock absorber 30. As shown in FIGS. 1 and 2, the bracket 4 has a substantially triangular planar shape when viewed in the vertical direction of the vehicle, and one side thereof, that is, a surface extending in the longitudinal direction of the vehicle body (a side rail indicated by reference numeral 13 in FIG. 4). Side vertical wall) is coupled to the outer surface of the side rail 1 in the vicinity of the gusset 12 which is a connecting member with the reinforcing cross member 10 via a plurality of bolts 30a, and is perpendicular to the side rail 1 side vertical wall 13 The other extending side (an attachment member side vertical wall of reference numeral 14 in FIG. 4) is coupled to the attachment member 5 of the shock absorber 30 via a plurality of bolts 30a. As shown in FIG. 3 and FIG. 4, the bracket 4 is formed in a substantially trapezoidal shape in which the shock absorber 30 side is wide in the height direction, and the rigidity is enhanced.

Further, as shown in FIG. 4, the bracket 4 has an upper wall 17 having a substantially triangular plane shape, a lower wall 18 having a substantially triangular planar shape, and a substantially triangular shape as described above. The slanted sides of the upper wall 17 and the lower wall 18 have side walls 16 that form walls between the upper wall 17 and the lower wall 18, and are constituted by the respective edges of the upper wall 17, the lower wall 18 and the side walls 16. A closed cross-sectional structure is formed in which the opened edge portion is closed by the side rail side vertical wall 13 and the attachment member side vertical wall 14.
Further, the side rail side vertical wall 13 has an appropriate distance from the joint between the reinforcing cross member 10 and the side rail 1 to the vicinity of the mounting member 5 on the outer wall of the side rail 1 and substantially over the entire area. These are fastened with a plurality of bolts 30a. Furthermore, the connection between the mounting member 5 and the mounting member side vertical wall 14 is also fastened by a plurality of bolts (not shown).
The holes 20 in the upper wall 17 and the holes 19 and 21 in the side wall 16 are working holes for fastening the bolt 30a.

  In this embodiment, the side wall 16 of the bracket 4 is formed wider in the height direction as it approaches the shock absorber 30 from the side rail 1, and gradually expands as the bracket 4 as a whole approaches the shock absorber 30. Thus, the rigidity for supporting the shock absorber 30 is enhanced. Further, the side rail side vertical wall 13 is fastened to the outer wall of the side rail 1 with a plurality of bolts 30a at an appropriate distance from the connecting portion between the reinforcing cross member 10 and the side rail 1 to the vicinity of the mounting member 5. Therefore, the offset load received by the shock absorber 30 by being shifted outward in the vehicle width direction can be transmitted as surface pressure to the side surface of the side rail 1 over substantially the entire area of the side rail side vertical wall 13. Since the impact force in the direction is also shared by each bolt 30a and transmitted to the side rail 1 side, stress can be dispersed, and the durability and the effect as an impact force buffering device can be sufficiently obtained.

  Further, the gusset 12 provided at the connecting portion of the reinforcing cross member 10 to the side rail 1 is disposed in the coupling surface of the bracket 4 with the side rail 1, and the side rail 1 from the bracket 4 side. The flow of force to the side is made smooth.

  In this embodiment, as shown in FIG. 1, when a shock unbalanced load F that is shifted in the vehicle width direction from the vehicle body center 1 a acts on the shock receiving member 3 a of the shock absorber 30 due to a vehicle collision, a plurality of mechanical fuses 3. Are simultaneously crushed to absorb the impact load. The unbalanced load after the shock is absorbed by the shock absorber 30 is one of the pair of brackets 4 whose plane shape is formed in a substantially triangular shape via the mounting member 5 of the shock absorber 30 (see FIG. 1 to the cross member 2 closer to the reinforcing cross member 10 and the shock absorber 30 via the side rail 1 on one side (the lower side rail in FIG. 1). It is further transmitted to the other side rail 1 (the upper side rail in FIG. 1) via the reinforcing cross member 10 and the cross member 2 in the vicinity of the reinforcing cross member 10.

Therefore, according to this embodiment, the offset load F after the shock is absorbed by the shock absorber 30 is applied to the mounting member 5 and the brackets 4, 1 in which the planar shape for the shock absorber 30 is formed in a substantially triangular shape. It is supported by the frame structure formed by the reinforcing cross member 10 provided between the pair of side rails 1 and provided with a gusset 12, the cross member 2 in the vicinity of the reinforcing cross member 10, and the pair of side rails 1. Therefore, the support rigidity is much higher than that of the support structure formed by the rod-shaped bracket, the one cross member horizontally provided between the pair of side rails, and the pair of side rails as in Patent Document 2. Become bigger.
Thereby, it is possible to prevent the buckling failure of the side rail 1 from occurring due to the bending moment caused by the offset load F.

In particular, the pair of brackets 4 are formed such that the planar shape of the pair of brackets 4 when viewed in the vehicle vertical direction is substantially triangular, and one side thereof is provided at the connecting portion 11 with the reinforcing cross member 10 of the side rail 1. Since the other side is coupled to the mounting member 5 of the shock absorber 30, the load passing through the bracket 4 from the mounting member 5 side of the shock absorber 30 is coupled to the outer surface near the gusset 12. The flow f has no deflection and becomes a uniform flow.
Thereby, it is possible to avoid an excessive force from acting on the connecting portion 11 between the bracket 4 and the side rail 1 and the connecting portion between the bracket 4 and the mounting member 5 to damage the vicinity of the connecting portion.

  According to the present invention, the uneven load after the shock is absorbed by the shock absorber is significantly larger in the support rigidity than the conventional support structure, and the side rail seat is caused by the bending moment caused by the uneven load. It is possible to provide a vehicle body frame with a shock absorber for a vehicle including a high-strength frame structure capable of preventing the occurrence of bending failure.

It is a principal part schematic plan view which shows the structure of the vehicle body frame with a buffer device of the road maintenance work vehicle which concerns on the Example of this invention. It is a top view of the road maintenance work vehicle in the said Example. It is a side view of the road maintenance work vehicle in the said Example. It is a schematic perspective view of the bracket attachment part in the said Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Side rail 2, 6 Cross member 3 Mechanical fuse 4 Bracket 5 Mounting member 10 Reinforcement cross member 11 Connection part 12 Gazette 30 Shock absorber 100 Body frame 102 Front wheel 103 Rear wheel

Claims (4)

Between a pair of left and right side rails extending in the longitudinal direction of the vehicle body, a plurality of cross members which are laterally arranged in the vehicle width direction and whose both ends are connected to the side rails are appropriately spaced in the longitudinal direction of the vehicle body. A vehicle having a vehicle body frame with a shock absorber provided with a vehicle body frame arranged and having a shock absorber that relieves an impact load applied to the vehicle body frame at the time of a vehicle longitudinal collision at the end of the vehicle body frame In
An attachment member for attaching the shock absorber to the end portion of the vehicle body frame, and a bracket interposed between the attachment member and the outside of the vehicle body frame to reinforce a fixing portion of the attachment member to the vehicle body frame; A vehicle having a vehicle body frame with a shock absorber, comprising a reinforcing cross member provided in the vicinity of a fixing portion of the bracket to the vehicle body frame and having both ends connected to side rails of the vehicle body frame. .   2. The vehicle having a vehicle body frame with a shock absorber according to claim 1, wherein at least one of the plurality of cross members is provided in the vicinity of the reinforcing cross member in the longitudinal direction of the vehicle body.   The bracket has a substantially triangular planar shape when viewed in the vehicle vertical direction, one side of which is coupled to the outer surface of the side rail in the vicinity of the connecting portion with the reinforcing cross member, and the other side of the bracket. 2. The shock absorber according to claim 1, wherein the shock absorber is coupled to a mounting member of the apparatus, and a connecting portion of the reinforcing cross member to the side rail is disposed in a coupling surface of the bracket to the side rail. A vehicle with a body frame.   The one side of the substantially triangular shape that is coupled to the outer surface of the side rail of the bracket has a plurality of bolts extending over a substantially entire area between the connecting portion of the reinforcing cross member and the side rail to the mounting member. 4. A vehicle having a vehicle body frame with a shock absorber according to claim 3, wherein the vehicle is fastened to an outer surface of the side rail.

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